I am working with 1.2.4 wicket release and have no problems with it.
You can also do what Martijn Dashorst suggested:

target.appendJavascript("document.getElementById('" +
component.getMarkupId() + "').style.display='none';"); 

Alex.



Gohan wrote:
> 
> Ok so what you're saying is that I should go with something like:
> public void onClick(AjaxRequestTarget target) {
>       label.setVisible(!label.isVisible());
>      target.addComponent(table);
> }
> 
> This doesn't work either.. I get a java.lang.NullPointerException when
> calling label.setVisible(..) when "!label.isVisible()" returns false. When
> I debug I come to versionManager.componentStateChanging(change); in the
> componentStateChanging method in class Page. But versionManager is null.
> I'm not using the latest snapshot but I tried downloading and installing
> it. But then I can't even build my projects due to the following error:
> "The project was not built since its build path is incomplete. Cannot find
> the class file for
> wicket.protocol.http.request.urlcompressing.UrlCompressor.".
> 
> 
> 
> 
> Alex Objelean wrote:
>> 
>> ... and a quick reply about your issue is (quoting Igor Vaynberg):
>> 
>> "the proper way to do this is to add button's parent, that way the parent
>> will repaint itself without the button's tag in it, and later when you
>> make it visible the parent will repaint itself with button's tags so
>> everything works nicely. "
>> 
>> 
>> 
> 
> 

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